Interstitial Heat Transfer Coefficient and Dispersion Conductivity in Compressed Metal Foam Heat Sinks

[+] Author and Article Information
Sheng-Chung Tzeng1

Department of Mechanical Engineering, Chienkuo Technology University, Changhua 500, Taiwan, ROCtsc@ctu.edu.tw

Tzer-Ming Jeng

Department of Mechanical Engineering, Air Force Institute of Technology, GangShan 820, Taiwan, ROC


Corresponding author.

J. Electron. Packag 129(2), 113-119 (Aug 11, 2006) (7 pages) doi:10.1115/1.2721081 History: Received April 14, 2005; Revised August 11, 2006

This work experimentally and numerically investigates the heat transfer in uncompressed∕compressed metal foams. Experiments were conducted to obtain the thermal characteristics of a rectangular channel filled with aluminum foams using air as the fluid medium. The experimental data reveal that the uncompressed sample has a larger Nusselt number (Nu) than the compressed sample. The 0.93 porosity sample has the largest average Nu followed by the 0.7 porosity sample; the 0.8 porosity sample has the worst average Nu. The experimental data concerning the 0.93 porosity samples (uncompressed samples) were consistent with the numerical predictions obtained using the model for high-porosity metal foam, reported elsewhere. Finally, a numerical model to simulate flow and heat transfer characteristics in compressed metal foams is presented and the interstitial heat transfer coefficient and dispersion conductivity were semi-empirically determined.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 6

Nu as a function of Re for different values of n and C for sample 5 in Table 1

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Figure 7

Nu as a function of Re for different values of CD for sample 92-06 in Table 3

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Figure 8

Comparison of numerical simulations (this study) with the experimental results in Boomsma (9) for samples in Table 3

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Figure 9

Local Nusselt number distributions in the flow direction for various compressed aluminum foams

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Figure 1

Schematic of the experimental setup

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Figure 2

Photograph of uncompressed∕compressed aluminum foam samples

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Figure 3

Test section and detailed measured position of thermocouples

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Figure 4

Wall-temperature distributions in the flow direction for various spreader thicknesses

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Figure 5

Comparison of experimental results (this study) with numerical simulations modeled by Calmidi and Mahajan (6) for samples in Table 2




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